Server-side rendering (SSR) optimization

Server-side rendering (SSR) enhances performance by optimizing first-screen loading and SEO, but improper implementation can backfire. Vite.js's SSR architecture leverages the ES module system to avoid bundling overhead, with its implementation divided into two phases: client-side build and server-side build. Key optimization strategies include dependency externalization, component-level code splitting, and streaming rendering. Caching strategies encompass page-level and component-level caching, while memory management optimizations involve leak prevention and large JSON handling. Build-time optimizations include pre-compiling static content and multi-process rendering. Monitoring involves collecting SSR performance metrics and handling error boundaries. Production environment optimizations consist of stress degradation and intelligent preloading. These measures collectively ensure high-performance SSR applications.

Long cache strategy and file hashing

A long caching strategy improves application loading speed by setting extended Cache-Control times, while file hashing resolves cache update issues. Vite's built-in mechanisms simplify the configuration process. Browsers leverage strong caching to reduce duplicate requests, and when file content changes, the hash value updates, triggering new resource requests. Vite supports three hash modes and defaults to the high-performance xxhash64 algorithm. Properly configuring HTTP cache headers, especially the immutable attribute, significantly boosts cache hit rates. Dynamic imports and SSR scenarios require special handling, and CDN deployments need adjusted caching rules. Versioned file management should include automatic cleanup, and performance monitoring should focus on cache hit rates and resource load time distribution. By integrating these techniques, an efficient caching strategy can be built.

Compression and optimization of build output

During production builds, Vitejs optimizes output files through multiple strategies to enhance application performance. In development mode, it leverages native browser ESM for fast startup, while production builds rely on Rollup for file compression, offering both Terser and ESBuild by default—the latter being faster but with slightly lower compression ratios. CSS code is further optimized through automatic minification and PostCSS plugins. For asset handling, small files are automatically inlined, while larger resources are recommended for externalization. Code splitting is achieved via dynamic imports and manual configuration, combined with Tree Shaking to eliminate unused code. Dual-version builds (modern and legacy) are generated for different browsers. Analysis tools help developers identify optimization points, and filenames are content-hash-based to ensure cache validity. Server-side rendering requires special configuration, and integrated performance monitoring tools output phased timing reports to assist developers in continuously optimizing the build process.

Static resource inlining and external referencing strategies

Static resource inlining and external loading strategies are key methods for front-end performance optimization in Vite.js. Choosing the right resource loading approach directly impacts page performance. Inlining is suitable for critical path resources, such as files smaller than 4KB, with thresholds adjustable via configuration. External loading is better for large files and shared resources, leveraging caching and reuse. A hybrid strategy can significantly boost performance—critical CSS is inlined while remaining styles are loaded asynchronously, and images are intelligently inlined or externalized based on size. Third-party libraries are split into separate bundles. Vite-specific optimizations include pre-bundling dependencies, WASM inlining, and Worker handling. Performance tests show the hybrid strategy performs best, with external resources paired with strong caching delivering better results. Modern image formats can be processed automatically and loaded dynamically based on network conditions. Build artifact visualization aids optimization. SSR mode requires special handling of resource loading strategies.

Best practices for code splitting

Vite.js, as a next-generation build tool, leverages native ESM support to achieve efficient code-splitting techniques, enhancing application performance. Code-splitting breaks the application into smaller chunks for on-demand loading. Vite extends dynamic import functionality, supporting route-level automatic splitting and dependency pre-bundling optimization. In React and Vue projects, route and component-level splitting can be achieved via `React.lazy` or by configuring `manualChunks`. Third-party library splitting strategies significantly reduce bundle size. Dynamic imports support variables and preloading, while CSS code-splitting allows separate file extraction. Preload directives and loading state management optimize user experience. In production, visualization tools analyze bundle size, and SSR scenarios require special handling. Performance monitoring relies on real-world data for continuous optimization. Common issues like flickering and path problems can be resolved with skeleton screens and `import.meta.glob`.

On-demand loading and dynamic import

Vitejs achieves efficient on-demand loading and dynamic import techniques through native ESM support. The dynamic import syntax `import()` returns a Promise to enable runtime module loading. In development, Vite leverages browser-native ESM, while in production, it uses Rollup to generate independent chunks. Route components are the most common scenario for dynamic imports, enabling code splitting when integrated with framework routing. Automatic preload hints optimize resource loading order. It supports glob import patterns for batch dynamic module loading. Third-party libraries like lodash can achieve fine-grained on-demand loading via their ESM versions. In React, `Suspense` can manage loading states. Custom chunking strategies are configurable via `rollupOptions`. Error handling for dynamic imports is necessary, and SSR requires special treatment. Browser tools can analyze performance metrics. Complex applications can combine conditional imports and parallel dynamic imports for advanced patterns. Vite's optimizer intelligently generates optimal code-splitting strategies.

Optimization configuration relying on pre-built dependencies

Vite's dependency pre-bundling is a key mechanism for improving performance in both development and production environments. By converting non-ESM dependencies into ESM format and merging small files to reduce request counts, proper configuration can optimize build speed and runtime efficiency. Pre-bundling automatically scans dependencies during the first startup, with results stored by default in the `node_modules/.vite` directory, though the cache location can be modified. You can manually specify dependencies to pre-bundle or exclude unnecessary ones. Cache control allows forcing a rebuild or customizing cache invalidation strategies. Advanced techniques include dependency preloading and multi-page application optimization. For production, pre-bundling strategies can be adjusted. Issues can be diagnosed using debug flags or plugins, and the pre-bundling process can be fully customized for special requirements. Integrating performance monitoring tools helps evaluate effectiveness, while integration with other build tools ensures compatibility. Handling special dependencies requires configuring extensions and loaders.

Plugin performance optimization suggestions

The Vite.js plugin system is a core feature, but improper usage can impact build performance. Optimizing plugin performance requires a multi-faceted approach. First, reduce the number of plugins and avoid using multiple plugins with similar functionalities simultaneously. Second, arrange plugin order strategically by placing high-frequency operations later to improve cache hit rates, while leveraging built-in plugin caching mechanisms. Development-specific plugins should be loaded on-demand. When writing custom plugins, avoid expensive operations and implement caching logic. Use tools like `vite-plugin-inspect` to analyze plugin time consumption. For specific plugins like image processing and TypeScript, apply targeted optimizations. For production builds, opt for faster compressors and establish performance benchmarks for continuous monitoring. By implementing these measures, Vite build performance can be significantly enhanced.

Output generation phase control

Vitejs adopts different strategies for handling resource output in development and production environments. In development mode, it relies on the browser's native ESM for on-demand compilation, while production builds use Rollup for full bundling. The basic configuration includes defining the output directory and static resource subdirectory. In production, resource files are automatically suffixed with hashes, and source maps are supported. Multi-page applications require configuring multiple entry points. Rollup plugins can modify the output structure. Environment variables can dynamically control the output content. Code splitting strategies optimize chunk division, and small files can be inlined to reduce requests. Plugins can preprocess the final output. Visualization tools can analyze build artifacts. Asynchronous components allow configurable loading behavior. SSR requires special configuration. Post-build checks can verify output quality. Output parameters can be adjusted for different environments. Deployment paths can be rewritten. Parallel processing speeds up builds. Special format requirements can be handled via plugins. Build hooks enable custom operations.

Application of build phase hooks

ViteJS build phase hooks are divided into two categories: build-time hooks and output generation hooks, which are used to insert custom logic at different stages of the build process. The article provides a detailed analysis of commonly used build hooks, such as `buildStart` for initialization, `resolveId` for module resolution, `load` for loading module content, and `transform` for code transformation, as well as output generation phase hooks like `renderStart`, `generateBundle`, and `writeBundle`. Advanced applications include custom file handling, build performance monitoring, and multi-environment build processing. It also covers hook execution order and dependency management, error handling techniques, and real-world integration examples such as automatic route generation, static asset version control, and multi-page application support, helping developers gain a deeper understanding and flexible use of Vite build hooks to optimize project build workflows.